fixed a collision detection bug for spherical cutters

* the early return caused by an edge-sphere collision was not correct


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@919 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/Cutters/SphericalCutter.py

@@ -234,8 +234,6 @@ class SphericalCutter(BaseCutter):
             d = d_e3
             cl = cl_e3
             cp = cp_e3
-        if cl and (direction.x == 0) and (direction.y == 0):
-            return (cl, d, cp)
         (cl_p1, d_p1, cp_p1) = self.intersect_sphere_vertex(direction,
                 triangle.p1, start=start)
         (cl_p2, d_p2, cp_p2) = self.intersect_sphere_vertex(direction,